The 20‑foot “dry van” container is the little workhorse you see stacked at the bows of most container vessels. Standardised under ISO 668 —it measures 20 ft × 8 ft × 8 ft 6 in (6.10 m × 2.44 m × 2.59 m) and provides about 32.6 m³ of usable volume — giving shippers a sweet spot between capacity and manoeuvrability. ITEH Standards
Inside dimensions are 5.90 m (L) × 2.35 m (W) × 2.39 m (H). In practice that works out to:
For oddly‑shaped cargo, our free CBM calculator lets you confirm everything will fit before you book.
Shippers choose the 20‑footer because dense or high‑value goods often max out weight long before volume, while the smaller footprint manoeuvres easily through older road and rail networks.
The empty (tare) weight sits around 2,300 kg; most carriers cap the gross at ≈ 28 t (25,400 kg) on a standard 20‑ft box. Maersk’s own spec sheet, for example, lists a payload ceiling of 28.2 t. (maersk.com) Always double‑check both the ocean‑carrier limit and local road regulations to avoid last‑minute re‑stows.
Cost lever | What it covers | When it spikes |
---|---|---|
Base ocean freight | Port‑to‑port move, often “all‑in” | Lanes with high demand or fuel volatility |
BAF (Fuel Adjustment Factor) | Offset bunker‑fuel swings | Adjusted quarterly; new tariffs Jan 2025 – Maersk (maersk.com) |
CAF (Currency Adjustment Factor) | Hedge against FX shifts | Kicks in on routes with USD / local‑currency gaps |
Port & terminal fees (THC, T3) | Load/unload & wharfage | Published annually by port authorities (e.g., Rotterdam 2025 tariff) (Port of Rotterdam) |
Special surcharges | Piracy, canal transit, congestion | Route‑specific, pre‑announced by carriers |
Plan ahead—especially July–November (global peak season) or just before Chinese New Year—to lock in space before vessels sell out.
Unsure? Feed your carton sizes into the CBM calculator—if it flags < 50 % utilisation, LCL is usually cheaper.
Smaller importers shouldn’t pay for cubic metres they’ll leave empty. The 20‑ft unit’s standard footprint moves seamlessly between ships, trucks and trains, minimizing transfers—while optional reefers, open‑tops and flat‑racks cover almost any commodity need.
Yes—ISO containers are Wind & Water Tight. Still, use desiccant packs to prevent condensation.
Yes—if it meets the IMDG Code; supply the MSDS, UN number and placards, and obtain carrier pre‑approval.
Multiply each box’s length × width × height (cm), add them up and divide by 1,000,000. Or use our CBM calculator in seconds.
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